Symfony Profiler

App\Entity\MediaTranslation {#1389
  -id: 1351
  -title: "Water purification"
  -description: """
    <p>The water we drink comes from surface water, like rivers and lakes and, from underground aquifers found in various geological formations. Unless the water collected is already of very high quality, it undergoes various treatment processes that remove any contaminants that could be harmful to human health.</p>\r\n
    \r\n
    <p>This animation follows step by step the different stages of the process which combines physical, chemical and biological actions.</p>
    """
  -legends: """
    Labels\r\n
    Water production\r\n
    Screening\r\n
    Flocculation tank\r\n
    Coagulant added\r\n
    Filtration\r\n
    Sand\r\n
    Ozonation\r\n
    Activated carbon filters\r\n
    Disinfection\r\n
    Chlorination\r\n
    Storage\r\n
    Distribution
    """
  -goals: """
    <ul>\r\n
    \t<li>To illustrate the main stages of water treatment.</li>\r\n
    </ul>
    """
  -more: """
    <p>Unless water comes from a&nbsp;source free&nbsp;of germs and pollutants,&nbsp;it must undergo a number of treatments before being distributed to consumers. To qualify as&nbsp;<strong>potable</strong> (drinking) water, it must meet strict standards set by the World Health Organization.</p>\r\n
    \r\n
    <p><strong>Screening</strong> removes larger debris (leaves and branches of trees, cans, bottles ...) by passing water through a set of&nbsp;grids generally of stainless steel. This waste is collected regularly and sent to a landfill.<br />\r\n
    <br />\r\n
    <strong>Coagulation</strong> neutralises the electric charges of the colloidal particles (from 1 nm to 1 micron) by adding a metal salt. <strong>Flocculation</strong> using&nbsp;polymer aggregates and neutralized particles, which then fall to the bottom of the tank: the <strong>floc</strong>. It requires a slow stirring and a optimum pH&nbsp;from 8.4 to 8.9. <strong>Settling</strong> can be static (force of gravity) or dynamic through decanter slats that can quickly separate water aggregates.<br />\r\n
    <br />\r\n
    <strong>Filtration&nbsp;</strong>is a mechanical treatment that eliminates smaller particles. They settle on a layer of sand or anthracite which retains them. They are then destroyed by bacterial flora.</p>\r\n
    \r\n
    <p><strong>Ozonation</strong> involves injecting a mixture of air with 8-10% ozone, which destroys pathogens by oxidation. It also eliminates a lot of micropollutants (pesticides) and improves the taste, smell and color of water.<br />\r\n
    <br />\r\n
    <strong>Activated carbon filtration</strong> retains molecules of pesticides, hydrocarbons and nitrate by adsorption. Activated carbon takes the form of grains mixed with water or in a filter.<br />\r\n
    <br />\r\n
    Final <strong>disinfection</strong> is a redox reaction obtained by <strong>chlorination</strong> (bleach or chlorine gas) which destroys the remaining germs before going into the pipes that carry water to the tap (fawcet). It also eliminates the residual nitrogen (ammonium).</p>\r\n
    \r\n
    <p>Two new filtration techniques are beginning to be used on an industrial scale, but their cost remains high. Injected under pressure, the water to be treated is filtered through a membrane which retains the dissolved pollutants, from biological, organic or inorganic sources&nbsp;regardless of their concentration.</p>\r\n
    \r\n
    <p>The <strong>ultrafiltration</strong> using a membrane made of thousands of very fine fibers inside a rigid sheath. The walls of each of the fibers are pierced with numerous pores with a size of about 0.01 microns. Activated carbon is mixed with water to be treated to remove certain residues such as pesticides.<br />\r\n
    In <strong>nanofiltration</strong>,&nbsp;a membrane has a porosity on the order of 0.001 microns. Consisting of three layers of different materials, it is wound around a central tube. Only drawback: the filtered water is so pure that it must be mineralized!</p>
    """
  -scenario: """
    <p>This scenario consists of three points: to question, understand and synthesize.</p>\r\n
    \r\n
    <p><strong>1. &nbsp;Question</strong></p>\r\n
    \r\n
    <p>The teacher can introduce the domestic water theme with a discussion with students. &nbsp;The goal is to get students to think about this natural resource and the course it follows from its collection in nature to the fawcet.</p>\r\n
    \r\n
    <ul>\r\n
    \t<li>Where does the water we drink come from?</li>\r\n
    \t<li>Does everybody around the world have the same access to this resource?</li>\r\n
    \t<li>Is water consummable from its place of collection?</li>\r\n
    \t<li>What are the changes that water must undergo before becoming drinkable?</li>\r\n
    </ul>\r\n
    \r\n
    <p>Further discussion can come from articles and photos selected by the teacher and responses from the public, dealing with the theme of water quality.<br />\r\n
    <br />\r\n
    The teacher identifies the keywords and synthesizes ideas from this discussion.</p>\r\n
    \r\n
    <p><strong>2.</strong> &nbsp;<strong>Understand</strong></p>\r\n
    \r\n
    <p>&nbsp;To understand the water distribution network and the different water treatment steps, three animations are available.</p>\r\n
    \r\n
    <ul>\r\n
    \t<li><strong>The distribution network&nbsp;</strong>to see water routing and water treatment together.</li>\r\n
    </ul>\r\n
    \r\n
    <p>Start the <a href="/en/media/533-water-distribution">Distribution network</a> animation.</p>\r\n
    \r\n
    <p>Describe the different elements of the landscape. Where does the water supply for the cities come from?<br />\r\n
    <br />\r\n
    Identify the storage area of natural water (sea, lake, river, groundwater), the city, the distribution system water (catchment, reservoir, water purification plant, water tower).<br />\r\n
    <br />\r\n
    The teacher uses the rollover to identify each site in the distribution network.</p>\r\n
    \r\n
    <p>For each identified site (catchment, reservoir, water tower), the teacher asks students about the function of these sites.</p>\r\n
    \r\n
    <ul>\r\n
    \t<li><strong>Water purification</strong></li>\r\n
    </ul>\r\n
    \r\n
    <p>Where is water collected?</p>\r\n
    \r\n
    <p>What makes collected water undrinkable? &nbsp;Natural debris, pollutants and germs.</p>\r\n
    \r\n
    <p>How is it made drinkable.</p>\r\n
    \r\n
    <p>Suggestion: &nbsp;make a sand filter to purify a sample of polluted water. Observe and analyze.<br />\r\n
    <br />\r\n
    Start this <em>Water Purification </em>simulation to describe the full course of treatment.</p>\r\n
    \r\n
    <ul>\r\n
    \t<li><strong>The water tower</strong></li>\r\n
    </ul>\r\n
    \r\n
    <p>How does clean drinking water arrive at the faucet? Storage (water tower) and distribution network.<br />\r\n
    <br />\r\n
    Make a schematic drawing of the principle of the water tower: place the water tower, houses, distribution pipes, draw water.</p>\r\n
    \r\n
    <p>Suggestion: &nbsp;perform an experiment with connected vessels: two tanks (water bottles) are connected by a flexible pipe (hose). Observe what happens when a tank is filled with water in the following three cases:</p>\r\n
    \r\n
    <ol>\r\n
    \t<li>2 tanks at the same level,</li>\r\n
    \t<li>the tank containing the water at a higher level,</li>\r\n
    \t<li>the tank containing the water at a lower level.</li>\r\n
    </ol>\r\n
    \r\n
    <p>Deduce the operating conditions of a water tower then start the <a href="/en/media/615-water-tower">Water tower</a> animation.</p>\r\n
    \r\n
    <p>Identify the elements of the water distribution network.</p>\r\n
    \r\n
    <p>Identify the elements that make up the water tower. &nbsp;Pump and reservoir.</p>\r\n
    \r\n
    <p>What happens if the reservoir of the water tower is lowered? &nbsp;Move the reservoir with the mouse to make the students react.</p>\r\n
    \r\n
    <p><strong>3. &nbsp;Synthesize</strong></p>\r\n
    \r\n
    <p>Suggestion: Organize a visit to a water distribution site.</p>\r\n
    \r\n
    <p>Students are divided into groups and each group carries a poster on the theme of the treatment and distribution of water:</p>\r\n
    \r\n
    <ul>\r\n
    \t<li>The texts are a reformulation of discussions and concepts introduced by the teacher,</li>\r\n
    \t<li>The illustrations are made from a selection of photos / documentation made available to students by the teacher or from a personal research done by each group.</li>\r\n
    </ul>
    """
  -features: "<p><strong>Click </strong>and <strong>drag </strong>the slider to observe a specific stage of the process.</p>"
  -publishedAt: DateTimeImmutable @1431302400 {#1386
    date: 2015-05-11 00:00:00.0 UTC (+00:00)
  }
  -preventIndexForSearch: false
  #locale: "en"
  #translatable: App\Entity\Media {#1308 …}
  #status: "published"
  #createdAt: DateTime @1208988000 {#1387
    date: 2008-04-23 22:00:00.0 UTC (+00:00)
  }
  #updatedAt: DateTime @1699136549 {#1388
    date: 2023-11-04 22:22:29.0 UTC (+00:00)
  }
}

[
  0 => "internal_api_media"
  "internal_api_media_options" => [
    "withBaseNodeName" => true
  ]
]